While going on a neighborhood run,I lost my rear brake. Well not lost as in missed placed but my brake pedal went instantly to the lever stop. When I am pushing the atv by hand I can stop the quad with the rear brake but above 15 mph its like i am not using any brake. Rechecked the pads at half way. I have about little more than half way between full and empty marks on the brake resevoir of fluid. Should I bleed or did I just blow out my master cylinder?

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sound like its lost pressure some ware ... you can try to bleed it ... but it might have fluid bypassing in the master cylinder ... you can rebuild it fairly cheap or buy a good used 1 on ebay ... or get new ..
if thats the problem ..

the dealer can order the rebuild kit and there are several companys that make them .. you can also check several atv parts places online ..just make shure you use some lube when puting it back together or you might tear a seal or O ring.. petrolium jelly works best

I completly flushed the rear brake and added new dot4. Bled the brake to get rid of the old fluid and no bubbles present. I got some pedal back but it goes away rather quickly. For a few minutes I could lock the rear tires then it gets mushy. Rebled and no better. So new mc.

the dealer can order the rebuild kit and there are several companys that make them .. you can also check several atv parts places online ..just make shure you use some lube when puting it back together or you might tear a seal or O ring.. petrolium jelly works best

Whats the best way to go? Factory or aftermarket? Complete mc or should I rebuild it?
If factory I will get it from Bikebandit.

i would take it apart and see what the prob. is .. if a seal is bad or O ring and check to make shure there are no scratches or scrapes in the body of it .. it its good inside you can rebuild it .. if not then you will have to replace it ..